html,
body {
    height: 100%;
}

body {
    padding-top: 45px;
    padding-bottom: 50px;
}

.头部 {
    width: 100%;
    height: 45px;
    position: fixed;
    top: 0;
    left: 0;
    padding: 5px;
}

.底部 {
    width: 100%;
    height: 50px;
    position: fixed;
    bottom: 0;
    left: 0;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}

.底部 a {
    color: #000;
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    padding: 4px;
    text-align: center;
}

.底部 a span {
    font-size: 20px;
}

.底部 a div {
    font-size: 13px;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

img {
    display: block;
    width: 100%;
}

.loadding {
    &::before {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: #fff;
        opacity: .5;
        content: "";
        z-index: 100;
    }
    &::after {
        font: normal normal normal 14px/1 FontAwesome;
        position: fixed;
        top: 40%;
        left: 50%;
        margin-left: -50px;
        font-size: 100px;
        color: #0094ff;
        content: "\f110";
        z-index: 101;
        animation: fa-spin 1s infinite linear;
    }
}